CN107364903B - Fine grating decontamination equipment and method - Google Patents
Fine grating decontamination equipment and method Download PDFInfo
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- CN107364903B CN107364903B CN201710458842.5A CN201710458842A CN107364903B CN 107364903 B CN107364903 B CN 107364903B CN 201710458842 A CN201710458842 A CN 201710458842A CN 107364903 B CN107364903 B CN 107364903B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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Abstract
The invention discloses fine grid decontamination equipment and a method for treating sewage by adopting the same, and relates to the field of sewage treatment. The fine grid dirt removing equipment comprises a grid groove, a grid filter plate arranged in the grid groove, a control system, an aeration dirt removing system, a slag discharging system and a liquid level difference detecting system, wherein the aeration dirt removing system, the slag discharging system and the liquid level difference detecting system are respectively connected with the control system; the aeration and decontamination system is used for removing the dirt blocking the grid filter plate on the water inlet side of the grid filter plate in the grid groove by taking air stirring as power; the slag discharging system is used for discharging grid slag on the water inlet side of the grid filter plate; the liquid level difference detection system is used for obtaining the liquid level of a water inlet side and the liquid level of a water outlet side of the grating filter plate in the grating groove or obtaining the liquid level difference value of the water inlet side and the water outlet side; the control system controls the start or the stop of the aeration decontamination system and the slag discharge system according to the liquid level difference value of the water inlet side and the water outlet side. The fine grid decontamination equipment is suitable for medium and small scale sewage treatment projects, and has the advantages of simple structure, low cost, low energy consumption, automatic control decontamination and convenient decontamination.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to fine grid sewage removal equipment and a method for treating sewage by adopting the equipment.
Background
The grid is the first treatment process after sewage enters a sewage plant. Generally, the grids are classified into a coarse grid (50-100mm), a medium grid (16-40mm) and a fine grid (3-10mm) according to the net spacing of grid bars. The function of the fine grid is to control the size of suspended pollutants in the water which finally enters the subsequent treatment unit, so as to prevent the pollutants from accumulating in the subsequent treatment unit and further causing damage to related equipment or influencing the quality of the effluent. A Membrane Bioreactor (MBR) is a new water treatment technology combining an activated sludge process and a Membrane separation technology. Since the MBR process enters the engineering application stage, the importance of fine grid pretreatment is more prominent due to the special sensitivity of the membrane module to large floating objects. Lack of effective fine grid treatment not only seriously affects the effluent quality, but also may cause membrane module damage, causing huge economic loss. With the continuous improvement of sewage treatment standards, MBR technology is being widely applied, and the function of the fine grid is becoming more and more indispensable.
At present, fine grid equipment mainly comprises a mechanical fine grid and an artificial fine grid, the existing mechanical fine grid is complex in structure, high in manufacturing cost and not easy to miniaturize, and therefore suitable fine grid equipment is not needed in small and medium-scale projects, and the utilization efficiency of the equipment is reduced, and energy and investment are wasted. Although the artificial fine grid is cheaper than a mechanical fine grid and has a simple structure, the workload of manual slag removal is huge, the labor intensity is high, the manual fine grid is troublesome, and the maintenance and the management are difficult. Therefore, how to simplify the fine grid equipment, reduce the investment and the workload of slag removal maintenance, and adapt to the requirements of medium and small scale sewage treatment is the problem to be solved.
Aiming at various problems of the existing fine grating decontamination equipment, the development of the fine grating decontamination equipment which has the advantages of simple structure, low cost, low energy consumption, automatic control decontamination, convenient decontamination and suitability for medium and small scale sewage treatment engineering is urgently needed.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides the fine grid sewage removal equipment which has the advantages of simple structure, low cost, low energy consumption, automatic control sewage removal and convenient sewage removal and is suitable for medium and small scale sewage treatment projects.
The invention also provides a method for treating sewage by adopting the fine grid sewage removal equipment, which can effectively remove solid pollutants in the sewage under the conditions of low energy consumption, low cost and automatic control of sewage removal.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides fine grid dirt removing equipment, which comprises a grid groove, a grid filter plate arranged in the grid groove, a control system, an aeration dirt removing system, a slag discharging system and a liquid level difference detecting system, wherein the aeration dirt removing system, the slag discharging system and the liquid level difference detecting system are respectively connected with the control system;
the aeration decontamination system is used for generating scouring gas at the water inlet side of the grid filter plate in the grid groove and removing the dirt blocking the grid filter plate by taking air stirring as power;
the slag discharging system is used for discharging grid slag on the water inlet side of the grid filter plate;
the liquid level difference detection system is used for obtaining the liquid level of the water inlet side and the liquid level of the water outlet side of the grating filter plate in the grating groove or obtaining the liquid level difference value of the water inlet side and the water outlet side of the grating filter plate in the grating groove;
and the control system controls the start or the stop of the aeration decontamination system and the slag discharge system according to the liquid level difference value of the water inlet side and the water outlet side of the grid filter plate.
Preferably, the planar arrangement of the grid filter plate in the grid groove is one of a U shape, an S shape, a labyrinth shape and a circular shape, and the plate surface of the grid filter plate is perpendicular to the bottom wall of the grid groove.
Preferably, the grating groove is internally provided with a filler positioned on the water inlet side of the grating filter plate;
a plurality of filter holes are formed in the grid filter plate, and the aperture of each filter hole is smaller than the particle size of the filler and the particle size of the grid slag.
Preferably, the aeration and decontamination system comprises an air blower and an aeration perforated pipe connected with the air blower, wherein the aeration perforated pipe is arranged at the bottom of the water inlet side of the grid filter plate in the grid groove and is arranged along the surface trend of the grid filter plate, and under the action of aeration stirring of the air blower and the aeration perforated pipe, the filler and air are jointly washed to scrub the surface of the grid filter plate so as to remove dirt blocking filter holes of the grid filter plate.
Preferably, the slag discharging system comprises a slag discharging port arranged at the bottom of the grating groove on the water inlet side of the grating filter plate and a slag discharging pipe connected with the slag discharging port, wherein a slag discharging control valve is arranged on the slag discharging pipe, and the control system is connected with the slag discharging control valve and used for opening or closing the slag discharging control valve.
Furthermore, the slag discharging system also comprises a slag discharging grate which is arranged above the slag discharging port, and the water passing size of the slag discharging grate is smaller than the grain size of the filler but larger than the grain size of the grate slag.
Preferably, the liquid level difference detection system comprises a water inlet side liquid level sensor and a water outlet side liquid level sensor which are respectively connected with the control system, and the water inlet side liquid level sensor is arranged on the water inlet side of the grating filter plate in the grating groove and used for detecting the liquid level on the water inlet side; the water outlet side liquid level sensor is arranged on the water outlet side of the grid filter plate in the grid groove and used for detecting the liquid level of the water outlet side.
The invention also provides a method for treating sewage by adopting the fine grid sewage removal equipment in any scheme, which comprises the following steps:
s1, filtering the sewage in the grating groove by the grating filter plate, intercepting the substances in the sewage which are larger than the aperture of the filtering holes of the grating filter plate at the water inlet side of the grating filter plate to accumulate to form grating slag, allowing the substances which are smaller than the aperture of the filtering holes of the grating filter plate to pass through the grating filter plate, and discharging the grating filtered water to a subsequent treatment process;
and S2, the control system controls the aeration decontamination system and the slag discharge system to be started or closed according to the liquid level difference value between the water inlet side and the water outlet side, and timely removes the dirt blocking the filter holes of the grid filter plate and discharges the grid slag accumulated on the water inlet side of the grid filter plate so as to maintain the effective water flux of the grid filter plate.
Preferably, the step S2 specifically includes:
when the liquid level difference value of the water inlet side and the water outlet side is increased to a first set liquid level difference value, the control system starts the blower, and gas generated by the blower and the filler jointly act to scour and remove grid slag blocking the surface of the grid filter plate;
when the liquid level difference value of the water inlet side and the water outlet side is reduced to a second set liquid level difference value smaller than the first set liquid level difference value, the control system turns off the air blower;
when the liquid level difference value of the water inlet side and the water outlet side is increased to a first set liquid level value, but the liquid level difference value of the water inlet side and the water outlet side is not reduced to a second liquid level difference value smaller than the first set liquid level difference value within the starting time of the air blower, the control system opens the slag discharging control valve, starts the slag discharging system and discharges grid slag;
when the slag discharging system is started, the control system closes the blower;
and when the time for starting the slag discharging system reaches the second set time, the control system closes the slag discharging control valve, and the slag discharging system is closed.
(III) advantageous effects
The invention has the beneficial effects that:
in the invention, the liquid level difference detection system can obtain the liquid level of the water inlet side and the liquid level of the water outlet side of the grating filter plate in the grating groove, or obtain the liquid level difference value of the water inlet side and the water outlet side of the grating filter plate in the grating groove. The aeration decontamination system generates scouring gas at the water inlet side of the grid filter plate in the grid groove, and automatically scours and removes the dirt blocking the filter holes on the surface of the grid filter plate through the combined action of the filler and the air. The slag discharging system can automatically discharge the grid slag intercepted on the water inlet side of the grid filter plate. The control system controls the start or the close of the aeration decontamination system and the slag discharge system according to the liquid level difference value of the water inlet side and the water outlet side, so that the automatic decontamination and slag discharge of the fine grid are realized, the decontamination efficiency is improved, and the decontamination effect is good.
Compared with the prior art, the fine grid decontamination equipment is suitable for medium and small scale sewage treatment projects, and has the advantages of simple structure, low cost, low energy consumption, automatic control decontamination and convenient decontamination.
Drawings
FIG. 1 is a plan view of a fine grid sewage disposal apparatus in example 1 of the present invention;
fig. 2 is a cross-sectional view taken along the line a-a in fig. 1.
Fig. 3 is a plan layout form view of the fine grid sewage disposal apparatus.
In the figure:
1. a grating groove; 2. a trough body; 3. a water inlet; 4. a water outlet; 5. a grid filter plate; 6. a blower; 7. an aeration perforated pipe; 8. a filler; 9. a slag discharge port; 10. a slag discharging grate; 11. a slag discharge control valve; 12. a slag discharge pipe; 13. a water inlet side liquid level sensor; 14. and a liquid level sensor at the water outlet side.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and 2, the present embodiment proposes a first preferred fine grid sewage disposal apparatus, which comprises a grid tank 1, a grid filter plate 5 disposed in the grid tank 1, a control system, an aeration sewage disposal system, a slag discharge system and a liquid level difference detection system, which are respectively connected to the control system.
In this embodiment, the grating groove 1 comprises a groove body 2, a water inlet 3 and a water outlet 4. The water inlet 3 and the water outlet 4 are respectively arranged on the side surface of the tank body 2. Sewage enters the grating groove 1 through the water inlet 3 and is filtered through the grating filter plate 5, large-particle solid pollutants in the sewage are removed, and damage of the solid matters in the sewage to subsequent treatment equipment (such as a water pump and the like) is eliminated and reduced. The grid filter plate 5 is uniformly distributed with a plurality of filter holes, the shape of the filter holes is not limited, the filter holes can be round or square, and the aperture of the filter holes is 1-5 mm. According to the process requirements, the aperture of the filter pores of the grid filter plate 5 should be smaller than the particle size of the filler 8 and the particle size of the intercepted material (grid slag), so that the material larger than the aperture of the filter pores of the grid filter plate 5 is intercepted, and the material smaller than the aperture of the filter pores of the grid filter plate 5 can pass through the grid filter plate 5 and be discharged to the subsequent treatment process along with the sewage.
The liquid level difference detection system comprises a water inlet side liquid level sensor 13 and a water outlet side liquid level sensor 14 which are respectively connected with the control system. The water inlet side liquid level sensor 13 is arranged on the water inlet side of the grating filter plate 5 in the grating groove 1 and used for detecting the liquid level of the water inlet side. The water outlet side liquid level sensor 14 is arranged on the water outlet side of the grid filter plate 5 in the grid groove 1 and is used for detecting the liquid level on the water outlet side.
The aeration and decontamination system comprises a blower 6, an aeration perforated pipe 7 and a filler 8. The blower 6 is connected with the aeration perforated pipe 7 and can be used for generating scouring gas at the water inlet side of the grid filter plate 5 in the grid groove 1. The aeration perforated pipe 7 is arranged at the bottom of the water inlet side of the grid filter plate 5 in the grid groove 1, and the whole body is arranged in parallel with the direction of the plate surface.
The filler 8 is arranged at the water inlet side of the grid filter plate 5 in the grid groove 1. Under the action of aeration and stirring of the blower 6, the filler 8 and air jointly scour and scrub the surface of the grid filter plate 5 to remove dirt blocking the filter holes of the grid filter plate 5.
The slag discharging system comprises a slag discharging port 9, a slag discharging grate 10, a slag discharging pipe 12 and a slag discharging control valve 11. The slag discharge port 9 is arranged at the bottom of the water inlet side of the grid filter plate 5, the slag discharge grate 10 is arranged above the slag discharge port 9, and the water passing size of the slag discharge grate 10 is smaller than the particle size of the filler but larger than the particle size of the intercepted grid slag, so that the grid slag can be discharged, and the filler can still be left in the grid groove 1 to continuously play a role in cleaning the dirt. Preferably, the pore diameter of the slag discharging grate 10 is 5-20mm, and the grain diameter of the filler is 10-25 mm. The slag discharging pipe 12 is connected with the slag discharging port 9, the slag discharging control valve 11 is arranged on the slag discharging pipe 12, and the control system is connected with the slag discharging control valve 11 and can control the opening or closing of the slag discharging control valve 11.
When solid pollutants in the sewage, which are larger than the aperture of the filtering holes of the grid filtering plate 5, are accumulated continuously to block the filtering holes of the grid filtering plate 5, the liquid level of the water inlet side of the grid filtering plate 5 is gradually increased to the liquid level of the water outlet side, when a control system receives a signal that the liquid level difference fed back by a liquid level sensor 13 at the water inlet side and a liquid level sensor 14 at the water outlet side reaches a set value A, the air blower 6 is automatically started, the aeration decontamination system uses air as stirring power to promote the combined action of the filler 8 and the air to continuously scour and scrub the surface of the grid filtering plate 5, the solid pollutants blocking the surface of the grid filtering; when the control system receives a signal that the liquid level difference value of the water inlet side and the water outlet side of the grid filter plate 5 is reduced to a set value B (B < A), the air blower 6 automatically stops running, and at the moment, the aeration decontamination system stops running.
Along with the outage of the aeration decontamination system, the grid slag on the water inlet side of the grid filter plate 5 begins to accumulate continuously and blocks the grid filter plate 5, so that the liquid level on the water inlet side rises above the liquid level on the water outlet side continuously, when the control system receives a signal that the liquid level difference value fed back by the liquid level sensor 13 on the water inlet side and the liquid level difference value fed back by the liquid level sensor 14 on the water outlet side reaches a set value A and the liquid level difference value on the water inlet side and the water outlet side does not fall to a set value B within a set time T1 after the aeration decontamination system is started, the slag discharge control valve 11 on the slag discharge pipe 12 is opened automatically, the grid slag intercepted by the grid filter plate 5 is discharged through the slag discharge port 9 and enters a subsequent grid slag treatment system. At the moment, the filler 8 in the grid groove 1 is intercepted by the slag discharging grate 10 above the surface of the slag discharging port 9, so that the grid slag can be discharged, and the filler 8 can still remain in the grid groove 1 to play a role of cleaning continuously. When the slag discharge control valve 11 is opened, the air blower 6 is automatically closed, and the aeration and sewage disposal system is automatically stopped. When the time after the opening of the slag discharge control valve 11 reaches the set time T2, the slag discharge control valve 11 is automatically closed, and the slag discharge system stops discharging slag. And the next automatic dirt removing and residue discharging circulation is entered again along with the accumulation of the grid slag on the water inlet side and the continuous rising of the liquid level on the water inlet side.
In the present embodiment, the plate surface of the grid filter plate 5 is arranged perpendicular to the bottom wall of the grid groove 1. As shown in fig. 3, the plane arrangement form of the grill filter plate 5 in the grill tank 1 is one of U-shaped, S-shaped, "concave" (or labyrinth) and circular, and the principle thereof is to change the treatment capacity of the fine grill cleaning apparatus by changing the flow area of the fine grill filter plate 5, and to select an appropriate plane arrangement form of the grill according to different sewage treatment scales and site conditions. Correspondingly, the aeration and exhaust pipes 7 arranged close to the grid filter plates 5 can also be U-shaped, S-shaped, "concave" (or labyrinth) or circular along the course of the planar arrangement of the grid filter plates 5.
The fine grid decontamination equipment can flexibly design the plane arrangement form of the grid filter plate 5 according to the sewage treatment scale and the sewage pollution degree, effectively solves the problem of inconsistent treatment capacity and treatment scale of the existing fine grid equipment under medium and small scale conditions, and has the characteristics of automatic control decontamination and convenient decontamination.
The fine grid sewage removal equipment can be used for treating sewage in small and medium scale sewage treatment projects, and the sewage treatment method specifically comprises the following steps:
(1) sewage enters the grating groove 1 from the water inlet 3 and is filtered by the grating filter plate 5, substances in the sewage, which are larger than the aperture of the filtering holes of the grating filter plate 5, are intercepted at the water inlet side of the grating filter plate 5, substances smaller than the aperture of the filtering holes of the grating filter plate 5 pass through the grating filter plate 5, and grating filtered water is discharged to a subsequent treatment process through the water outlet 4;
(2) the liquid level at the water inlet side is continuously increased along with the continuous accumulation of the grid slag at the water inlet side of the grid filter plate 5, when a control system receives a signal that the difference value of the liquid levels at the water inlet side and the water outlet side of the grid filter plate 5 reaches a set value A, the air blower 6 is automatically started, aeration is carried out in the grid groove 1 through the aeration perforated pipe 7, air stirring is used as power, the filler 8 and large granular solid matters intercepted by the grid filter plate 5 are repeatedly washed and scrubbed on the surface of the grid filter plate 5, so that pollutants blocking filter holes of the grid filter plate 5 are removed, and the water flux is;
(3) along with the operation of the aeration and decontamination system, the water passing flux of the grille filter plate 5 is gradually recovered, the liquid level difference value of the water inlet side and the water outlet side of the grille filter plate 5 is continuously reduced, and when the control system receives a signal that the liquid level difference value of the water inlet side and the water outlet side is reduced to a set value B, the air blower 6 is automatically closed.
(4) When the control system receives that the liquid level difference value of the water inlet side and the water outlet side of the grid filter plate 5 is increased to a set value A, but under the combined flushing action of the filler 8 and the air of the aeration decontamination system, the liquid level difference value is still not reduced to a set value B (B < A) within a set time T1, the deslagging control valve 11 is automatically opened, the air blower 6 is automatically closed, the grid slag intercepted by the grid filter plate 5 is discharged through the deslagging port 9, and the filler 8 is intercepted by the grate slag 10 and is continuously remained in the grid groove 1. The grid slag discharged from the slag discharge port 9 enters a subsequent grid slag treatment unit for dewatering and volume reduction, and the separated sewage returns to the grid water.
(5) After the opening time of the slag discharge control valve 5 reaches the set time T2, most of the grid slag accumulated on the water inlet side is discharged out of the grid groove 1, and the slag discharge control valve 11 is automatically closed.
Example 2
This embodiment proposes a second preferred fine grid sewage disposal apparatus having substantially the same structure as that of the fine grid sewage disposal apparatus described in embodiment 1, except that: no filler 8 is arranged in the grid grooves 1.
Specifically, the aeration decontamination system of the embodiment includes the blower 6 and the aeration perforated pipe 7, and the surface of the grille filter plate 5 is scrubbed only by air under the action of aeration agitation to remove solid pollutants blocking the filter holes of the grille filter plate 5, thereby achieving the purpose of decontamination, and the implementation effect is not as good as that of the embodiment 1.
Other structures of the fine grid sewage disposal apparatus in this embodiment are the same as the corresponding structures of the fine grid sewage disposal apparatus described in embodiment 1, and are not described herein again.
In the present invention, the number of aeration perforated pipes 7 in examples 1 and 2 is not limited to one, and may be two or more. Taking three aeration perforated pipes 7 as an example, the three aeration perforated pipes 7 are all connected with the air blower 6, the three aeration perforated pipes 7 are arranged along the plate surface of the grid filter plate 5 in parallel at intervals, and under the action of sufficient aeration stirring power, solid pollutants blocking the surface of the grid filter plate 5 are more fully removed, so that the automatic dirt removing effect is better.
In summary, compared with the conventional fine grid decontamination technology, the fine grid decontamination apparatus and method of the present invention have the following significant advantages:
(1) the device has simple structure, low cost and low energy consumption, can automatically control and clean the sewage, is convenient to clean and is suitable for medium and small scale sewage treatment projects;
(2) the fine grid decontamination method can effectively remove solid pollutants in the sewage under the conditions of low energy consumption, low cost and automatic control.
It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (6)
1. A fine grid decontamination equipment comprises a grid groove (1) and a grid filter plate (5) arranged in the grid groove (1), and is characterized by also comprising a control system, an aeration decontamination system, a slag discharge system and a liquid level difference detection system which are respectively connected with the control system;
the aeration decontamination system is used for generating scouring gas at the water inlet side of the grid filter plate (5) in the grid groove (1) and removing the dirt blocking the grid filter plate (5) by taking air stirring as power;
the slag discharging system is used for discharging grid slag on the water inlet side of the grid filter plate (5);
the liquid level difference detection system is used for obtaining the liquid level of the water inlet side and the liquid level of the water outlet side of the grating filter plate (5) in the grating groove (1), or obtaining the liquid level difference value of the water inlet side and the water outlet side of the grating filter plate (5) in the grating groove (1);
the control system controls the start or the stop of the aeration decontamination system and the slag discharge system according to the liquid level difference value of the water inlet side and the water outlet side of the grid filter plate (5);
the grating groove (1) is internally provided with a filler (8) positioned on the water inlet side of the grating filter plate (5), the grating filter plate (5) is provided with a plurality of filter holes, and the aperture of each filter hole is smaller than the particle size of the filler (8) and the particle size of grating slag;
the aeration decontamination system comprises an air blower (6) and an aeration perforated pipe (7) connected with the air blower, wherein the aeration perforated pipe (7) is arranged at the bottom of the water inlet side of a grid filter plate (5) in a grid groove (1) and is arranged along the surface trend of the grid filter plate (5), and under the aeration stirring action of the air blower (6) and the aeration perforated pipe (7), a filler (8) and air are jointly washed to scrub the surface of the grid filter plate (5) to remove dirt blocking filter holes of the grid filter plate (5).
2. The fine grid desmear apparatus of claim 1, wherein: the plane arrangement form of the grid filter plate (5) in the grid groove (1) is one of U-shaped, S-shaped, labyrinth type and circular, and the plate surface of the grid filter plate (5) is perpendicular to the bottom wall of the grid groove (1).
3. The fine grid desmear apparatus of claim 1, wherein: the slag discharging system comprises a slag discharging port (9) arranged at the bottom of the grid groove (1) on the water inlet side of the grid filter plate (5) and a slag discharging pipe (12) connected with the slag discharging port (9), wherein a slag discharging control valve (11) is arranged on the slag discharging pipe (12), and the control system is connected with the slag discharging control valve (11) and used for opening or closing the slag discharging control valve (11).
4. The fine grid desmear apparatus of claim 3, wherein: the slag discharging system further comprises a slag discharging grate (10), the slag discharging grate (10) is arranged above the slag discharging port (9), and the water passing size of the slag discharging grate (10) is smaller than the grain size of the filler (8) but larger than the grain size of the grate slag.
5. The fine grid desmear apparatus of claim 1, wherein: the liquid level difference detection system comprises a water inlet side liquid level sensor (13) and a water outlet side liquid level sensor (14) which are respectively connected with the control system, wherein the water inlet side liquid level sensor (13) is arranged on the water inlet side of the grating filter plate (5) in the grating groove (1) and is used for detecting the liquid level of the water inlet side; the water outlet side liquid level sensor (14) is arranged on the water outlet side of the grid filter plate (5) in the grid groove (1) and used for detecting the liquid level on the water outlet side.
6. A method for treating sewage using the fine grid sewage treatment apparatus as set forth in any one of claims 1 to 5, wherein:
the method comprises the following steps:
s1, filtering sewage in the grid groove (1) by a grid filter plate (5), intercepting substances in the sewage, which are larger than the aperture of filter holes of the grid filter plate (5), on the water inlet side of the grid filter plate (5) to accumulate to form grid slag, allowing substances smaller than the aperture of the filter holes of the grid filter plate (5) to pass through the grid filter plate (5), and discharging grid filtered water to a subsequent treatment process;
s2, the control system controls the start or the close of the aeration decontamination system and the slag discharge system according to the liquid level difference value of the water inlet side and the water outlet side, and timely removes the dirt blocking the filtering holes of the grid filtering plate (5) and the accumulated grid slag discharged from the water inlet side of the grid filtering plate (5) so as to keep the effective water flux of the grid filtering plate (5);
the step S2 specifically includes:
when the liquid level difference value of the water inlet side and the water outlet side is increased to a first set liquid level difference value, the control system starts the air blower (6), and gas generated by the air blower (6) and the filler (8) jointly act to flush and remove grid slag blocking the surface of the grid filter plate (5);
when the liquid level difference value of the water inlet side and the water outlet side is reduced to a second set liquid level difference value smaller than the first set liquid level difference value, the control system turns off the blower (6);
when the liquid level difference value of the water inlet side and the water outlet side is increased to a first set liquid level value, but the liquid level difference value of the water inlet side and the water outlet side is not reduced to a second liquid level difference value smaller than the first set liquid level difference value within the starting time of the air blower (6), the control system starts the slag discharging control valve (11), starts the slag discharging system and discharges grid slag;
when the slag discharging system is started, the control system closes the blower (6);
when the time for starting the slag discharging system reaches the second set time, the control system closes the slag discharging control valve (11), and the slag discharging system is closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710458842.5A CN107364903B (en) | 2017-06-16 | 2017-06-16 | Fine grating decontamination equipment and method |
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| CN201710458842.5A CN107364903B (en) | 2017-06-16 | 2017-06-16 | Fine grating decontamination equipment and method |
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| CN107364903A CN107364903A (en) | 2017-11-21 |
| CN107364903B true CN107364903B (en) | 2020-04-24 |
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| CN108726797A (en) * | 2018-05-31 | 2018-11-02 | 安徽中疆环境科技有限公司 | A kind of water environment dirt separation equipment |
| CN108837586A (en) * | 2018-08-30 | 2018-11-20 | 环能科技股份有限公司 | A kind of back purge system and back-purge system with self-cleaning function |
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